package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import com.sky.utils.JwtUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.impl.client.HttpClients;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;


@Service
@Slf4j
public class UserServiceImpl implements UserService {

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;

    public User wxLogin(UserLoginDTO userLoginDTO) {
        //通过HttpClient发起请求，调用微信服务器接口，获得openid
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", userLoginDTO.getCode()); //前端登录时获取的 code
        map.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet("https://api.weixin.qq.com/sns/jscode2session", map);
        //使用fastjson解析json字符串
        JSONObject jsonObject = JSON.parseObject(json);
        //获取openid
        String openid = jsonObject.getString("openid");

        //判断openid是否为空，为空则登录失败
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断当前用户是否为新用户，通过数据库中是否存在该openid，如果是则自动完成注册
        //调用usermapper，查询数据库中的该openid是否存在
        User user = userMapper.getByOpenid(openid);
        if (user == null) {
            //自动完成注册，保存标识，其他信息通过后续用户信息修改添加
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            //保存到数据库中 , 将新添加的用户id返回到user对象中
            userMapper.insert(user);
        }

        //返回用户对象

        return user;
    }
}
